4 In Fig. 9.1, a 12 V battery supplies a current \( I \) to a circuit. The circuit contains a thermistor and a \( 1000 \Omega \) resistor in parallel, with a \( 500 \Omega \) resistor in series.
Fig. 9.1
(a) At a certain temperature, the thermistor has a resistance of \( 1000 \Omega \).
Calculate
(i) the combined resistance of the thermistor and the \( 1000 \Omega \) resistor,
resistance = \( \qquad \)
[2]
(ii) the current \( I \),
current = \( \qquad \)
[1]
(iii) the potential difference across the \( 500 \Omega \) resistor.
potential difference = \( \qquad \)
[2]
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